CN101157986A - Rapid nontoxic gold extracting method - Google Patents
Rapid nontoxic gold extracting method Download PDFInfo
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- CN101157986A CN101157986A CNA2007100505006A CN200710050500A CN101157986A CN 101157986 A CN101157986 A CN 101157986A CN A2007100505006 A CNA2007100505006 A CN A2007100505006A CN 200710050500 A CN200710050500 A CN 200710050500A CN 101157986 A CN101157986 A CN 101157986A
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Abstract
The invention relates to a wet gold extraction method, and is a quick and non-toxic gold extraction method. The method uses the solution of sodium bromate, sodium chloride and vitriol as the gold leaching solution, polyurethane foam as the substance to absorb gold, sodium sulfite solution as a desorption agent, oxalic acid as a reducing agent, hydrochloride solution as recycling agent of polyurenthane foam, extract gold from oxide ore with the sulfur content of no more than 2% and gold concentrate after roasting. The method of the invention is non-toxic and the gold leaching speed is a few to a dozen times as fast as that in cyannidation.
Description
Technical field
The present invention relates to hydrometallurgy, more particularly the present invention is a kind of method of wet gold extraction.
Background technology
Existing commonly used technology for gold extraction, gold industry at present, major part all adopts extraction of gold by cyanidation, and the advantage of cyanide process is: 1. cost is low, 2. can the molten gold of normal temperature and pressure, gold complex is stable.3. technology is simple and easy to grasp, and wide adaptability soaks regardless of the simple and easy pond that is common people, and still large-scale heap drenches, complete regular gold selects the stirring mud carbon-in-pulp process of smelting factory all to use extraction of gold by cyanidation.The cyanide process shortcoming is: 1. hypertoxic, environmental protection is made a very bad impression.2. golden extraction time is long.3. to some objectionable impurities; As arsenic, cupric oxide, etc. objectionable impurities, cyanidation technology is difficult to reach the ideal extraction yield.4. secondly temperature to be lower than 15 ℃ of dissolvd gold speeds slower.5. gold is almost insoluble under anoxia condition.6. use a large amount of zinc metals and gac displacement absorption to reclaim gold.
Summary of the invention
The present invention is in order to overcome the deficiencies in the prior art, and a kind of equipment that utilizes prior art, rapid nontoxic, gold extracting method simple to operate are provided.
In order to solve the problems of the technologies described above, the present invention is achieved by following technical proposals:
A kind of method of rapid nontoxic gold extracting, its raw material is no more than 2% oxidized ore and baked gold ore for sulfur-bearing after fragmentation, make gold leaching solution with sodium bromate, sodium-chlor and the vitriolic aqueous solution, polyurethane foam is made adsorptive, sodium sulfite aqueous solution is made strippant, oxalic acid and is made the regenerator that reductive agent, aqueous hydrochloric acid are made polyurethane foam, and the operation steps that the present invention stirs gold leaching-out process is as follows:
1). the preparation gold leaching solution: sodium bromate, sodium-chlor, sulfuric acid and the water of technical grade is mixed with the acid gold leaching solution of PH＜3, and wherein each component concentration is, sodium bromate 0.1～2%, sodium-chlor 1～8%, sulfuric acid 0.1～1%;
2) leaching: the gold mine powder of gold leaching solution and 0.130～0.061mm is added in the golden container of soaking of belt stirrer, and pulp density is 30～40%, and normal temperature and pressure is leaching 1～4h down, obtains auriferous leaching liquid;
3) absorption: polyurethane foam is put into 2) soak golden container, the gold under stirring condition in the foam absorption leaching liquid, adsorption time 20～50min.
4) desorb: take out the foam of ADSORPTION OF GOLD, wash the mud on the foam off, dry, put into temperature and be 50～90 ℃, concentration and be sodium sulfite aqueous solution desorb 20～50min of 0.1～0.6%, the gold that is adsorbed on the foam is desorbed desorption efficiency 84～96%.Dry foam, obtain gold-containing solution; Take out remaining ore pulp lean solution behind the foam, the gold-leaching lean solution after isolating mine tailing returns 1) in make preparation gold leachate usefulness;
5) foam regeneration: with 4) foam after drying dries promptly reusable with 1: 1 technical hydrochloric acid aqueous solution soaking 20min;
6) reduction: 4) add 1～5% oxalic acid in the gold-containing solution that obtains and carry out reduction reaction, 50～90 ℃ of temperature of reaction, reaction times 20～40min is reduced into sponge shape gold with the gold in the gold-containing solution, obtains ingot through precipitating, dry, melting.
2) operation steps of gold extracting method is soaked in the pond:
Raw material, gold leaching solution, adsorptive, strippant, reductive agent, foam regenerator and operation steps processing condition that gold extracting method is soaked in the pond are all identical with the stirring gold extracting method, just with 2) the leaching operation changes into: gold mine grain and the gold leaching solution of granularity 0.30～3mm are put into soaking pit, liquid is crossed the ore particle surface, about 2: 1 of solid-liquid weight ratio, soak 12～24h, obtain auriferous leach liquor; With 3) adsorption operations changes into and allows auriferous leach liquor flow through polyurethane foam case or post, and cycle number is all over three times, and foam adsorbs the gold in the leaching liquid.
Sulfuric acid in the gold leachate of the present invention can be the mixing acid of hydrochloric acid, nitric acid or sulfuric acid, hydrochloric acid, nitric acid, only needs PH＜3 to get final product.
The present invention's beneficial effect compared with the prior art is:
1. gold leaching solution is nontoxic, and wherein sodium-chlor is the requisite of people's diet, and sodium bromate is an oxygenant, Inorganic Chemicals does not need public security department to give special approval to and buys protection against the tide during accumulating, solar heat protection, isolate with combustion-supporting product and inflammable substance, be safety, sulfuric acid is because concentration is not high, certain pungency and corrodibility are arranged, but do not discharge, recycle, note protection when only needing operation.
2. carry fast several times to tens times of golden speed, high 3～10 percentage points of leaching yield than prior art.
3. polyurethane foam is made the material of ADSORPTION OF GOLD, and it has, and the source of goods is wide, adsorption rate is high, desorption rate is fast, the desorption efficiency height, and regeneration is simple, reusable characteristics.Gold manufacturing enterprise uses the inventive method can save a large amount of zinc metals and gac.
4. the prior art oxidized ore that is difficult to leach, the present invention can reach the ideal leaching yield, even can extract precious metals such as copper, silver etc. earlier earlier, carry gold then, has both reclaimed other metal values, can reduce again and carry golden cost.
5. to carry golden cost basic fair with the prior art cost for present method.
Description of drawings
Fig. 1 is that the present invention stirs the gold leaching-out process process flow sheet.
Fig. 2 is the technology flow graph that gold extracting method is soaked in pond of the present invention.
Embodiment
The present invention leaches golden principle; 1. at sodium bromate, in the sulphuric acid soln of sodium-chlor, sodium bromate can be oxidized to the chlorine molecule to chlorion, and the water-soluble part of chlorine molecule generates hypochlorous acid and hydrochloric acid.Sodium bromate is reduced into bromide anion, and bromide anion can generate bromine simple substance with the sodium bromate reaction again.Therefore there is sodium bromate, chlorine molecule, multiple oxygenants such as hypochlorous acid and bromine in this solution.Gold is oxidized to the monovalence gold under the oxygenant effect, and the monovalence gold forms two coordinate AuCl with chlorion or bromide anion
2Or AuBr
2, the formation of coordination 2 has reduced golden oxidized electrode potential.AuCl
2Or AuBr
2Also can further be oxidized to the trivalent gold, the trivalent gold can form the title complex such as the AuCl of four-coordination again with CI ion or Br ion
4Or AuBr
4, or form mixed matching coordination ion such as AuCl
2Br
2Deng.The reduction potential of gold is further reduced, be beneficial to the leaching of gold.Therefore, the aqueous sulfuric acid of sodium bromate sodium-chlor is the good extraction liquid that extracts gold.
Below in conjunction with process flow sheet and embodiment the present invention is done further detailed narration.
The gold mine that embodiment uses is the micro-fine-grained gold oxidized ore of Baise of Guangxi gold mine, experimentizes after fragmentation.
1. stirring gold leaching-out process:
The acid gold leaching solution that sodium bromate, sodium-chlor, sulfuric acid, hydrochloric acid or nitric acid and the water of technical grade is mixed with PH＜3, wherein sodium bromate 0.1～2%, sodium-chlor 1～8%, sulfuric acid, hydrochloric acid are or/and nitric acid 0.1～1%, under stirring condition, the adding granularity is the micro-fine-grained gold oxidation breeze of 0.130～0.061mm (120 orders～250 orders); Regulating pulp density is 30～40%, stirs leaching 1～4h at normal temperatures and pressures, obtains auriferous leaching liquid, and leaching rate is 99%.Under agitation condition, polyurethane foam is dropped into absorption gold wherein in the auriferous leaching liquid, adsorption time 20～50min, adsorption rate is 85～98%.The taking-up foam dries, and washes mud off, dries, and puts into temperature and be 50～90 ℃, the sodium sulfite aqueous solution desorb of concentration 0.1～0.6%, and desorb 20～50min, desorption efficiency are 84～96%.In the gold-containing solution that desorbs, add 1～5% oxalic acid and carry out reduction reaction, 50～90 ℃ of temperature of reaction, reaction times 20～40min, reduction ratio are 90～96%.Obtain sponge shape gold through precipitation, dry, fusing obtains purity and is＞99% ingot, and total recovery is 63～94%.
Present method embodiment 1～3, and concrete data are seen the embodiment summary sheet.
2. gold extracting method is soaked in the pond:
1. prepare gold leaching solution, method is soaked gold with stirring, and gets the bromine gold leachate in industrial pond;
2. the Gold Ore of granularity 0.30～3mm is put into mine-dipping pool, the gold leaching solution that 1. prepares is put into mine-dipping pool, the solid-liquid weight ratio is about 2: 1 normal temperature and pressure ponds and soaks 12～24h, lean solution is separated obtaining auriferous leach liquor, leaching rate 90～99% with mine tailing.
3. absorption: allow contain golden leach liquor stream and reach polyurethane foam case or post, dominant discharge 50kg/h circulates three times.Foam is with the absorption of the gold in the leach liquor, adsorption rate 98%.
4. desorb: identical with the desorption method that stirs gold extracting method;
5. reduction: identical with the desorption method that stirs gold extracting method.
The pond is soaked gold extracting method and is applicable to that also piling pouring carries gold.
Present method embodiment 4～6, and concrete data are seen the embodiment data summary table.
More than in the operating process of two kinds of gold extracting methods: 1) the remaining gold leachate in foam absorption back can return preparation gold leaching solution operation, utilizes the new gold leaching solution of its preparation; 2) foam after the desorb behind 1: 1 aqueous hydrochloric acid immersion regeneration 20min, can be reused; 3) restore the sponge gold after, remaining lean solution transfers to weakly alkaline with alkali and returns and repeat to do stripping liquid in the stripping liquid and use.
The embodiment data summary table
| Gold extracting method | Stir the leaching method | The pond is soaked heap and is drenched extraction method | ||||||
| Embodiment | 1 | ?2 | ?3 | ?4 | ?5 | ?6 | ||
| Leaching | Ore Gold Content (g/T) | 5 | ?5 | ?105 | ?5 | ?5 | ?5 | |
| Granularity (mm) | 0.130 | ?0.13 ?0 | ?0.07 ?7 | ?0.3 ?～3 | ?0.3～ ?3 | ?0.3 ?～3 | ||
| Charging capacity (kg) | 500 | ?500 | ?500 | ?500 | ?500 | ?500 | ||
| Gold leaching solution | Sodium bromate (%) | 0.1 | ?0.25 | ?1.0 | ?0.1 | ?0.25 | ?1.0 | |
| Sodium-chlor (%) | 1.0 | ?2.5 | ?4.0 | ?1.0 | ?2.5 | ?4.0 | ||
| Sulfuric acid (%) | 0.5 | ?0.5 | ||||||
| Hydrochloric acid (%) | 0.1 | ?0.1 | ||||||
| Nitric acid (%) | 1.0 | ?1.0 | ||||||
| Pulp density (%) | 30 | ?35 | ?40 | Gu: liquid (weight ratio)=2: 1 | ||||
| Leaching time (h) | 3 | ?2 | ?2 | ?24 | ?24 | ?12 | ||
| Leaching rate (%) | 98.5 | ?99.0 | ?99.2 | ?90.1 | ?98.3 | ?99.4 | ||
| Absorption | Adsorption time (min) | 20 | ?40 | ?50 | Circulate three times | |||
| Adsorption rate (%) | 85 | ?98 | ?98 | ?98 | ?98 | ?98 | ||
| Desorb | S-WAT (%) | 0.6 | ?0.6 | ?0.6 | ?0.6 | ?0.6 | ?0.6 | |
| Desorption time (min) | 20 | ?40 | ?50 | ?20 | ?40 | ?50 | ||
| Desorb rate (%) | 84 | ?96 | ?96 | ?84 | ?96 | ?96 | ||
| Reduction | Oxalic acid amount (%) | 1 | ?5 | ?5 | ?1 | ?5 | ?5 | |
| Temperature (℃) | 50 | ?90 | ?90 | ?50 | ?90 | ?90 | ||
| Time (min) | 20 | ?40 | ?40 | ?20 | ?40 | ?40 | ||
| Reduction ratio (%) | 90 | ?96 | ?96 | ?90 | ?96 | ?96 | ||
| Pan amount (g) | 1.58 | ?2.37 | ?49.7 ?2 | ?1.68 | ?2.35 | ?2.36 | ||
| Total recovery (%) | 63 | ?94.6 | ?94.7 | ?67 | ?94.0 | ?94.3 | ||
Claims (3)
1. the method for a rapid nontoxic gold extracting, its raw material is no more than 2% oxidized ore and baked gold ore for sulfur-bearing after fragmentation, it is characterized in that, make gold leaching solution with sodium bromate, sodium-chlor and the vitriolic aqueous solution, polyurethane foam is made adsorptive, sodium sulfite aqueous solution is made strippant, oxalic acid and is made the regenerator that reductive agent, aqueous hydrochloric acid are made polyurethane foam, and the present invention stirs gold leaching-out process, and the concrete operations step is as follows:
1). the preparation gold leaching solution: sodium bromate, sodium-chlor, sulfuric acid and the water of technical grade is mixed with the acid gold leaching solution of PH＜3, and wherein each component concentration is, sodium bromate 0.1～2%, sodium-chlor 1～8%, sulfuric acid 0.1～1%;
2) leaching: the gold mine powder of gold leaching solution and 0.130～0.061mm is added in the golden container of soaking of belt stirrer, and pulp density is 30～40%, and normal temperature and pressure is leaching 1～4h down, obtains auriferous leaching liquid;
3) absorption: polyurethane foam is put into 2) soak golden container, the gold under stirring condition in the foam absorption leaching liquid, adsorption time 20～50min.
4) desorb: take out the foam of ADSORPTION OF GOLD, wash the mud on the foam off, dry, put into temperature and be 50～90 ℃, concentration and be sodium sulfite aqueous solution desorb 20～50min of 0.1～0.6%, the gold that is adsorbed on the foam is desorbed, dry foam, obtain gold-containing solution; Take out remaining ore pulp lean solution behind the foam, the gold-leaching lean solution after isolating mine tailing returns 1) in make preparation gold leachate usefulness;
5) foam regeneration: with 4) foam after drying dries promptly reusable with 1: 1 technical hydrochloric acid aqueous solution soaking 20min;
6) reduction: 4) add 1～5% oxalic acid in the gold-containing solution that obtains and carry out reduction reaction, 50～90 ℃ of temperature of reaction, reaction times 20～40min is reduced into sponge shape gold with the gold in the gold-containing solution, obtains ingot through precipitating, dry, melting.
2. a kind of rapid nontoxic gold extracting method according to claim 1, it is characterized in that, raw material, gold leaching solution, adsorptive, strippant, reductive agent, foam regenerator and the operation steps processing condition of gold extracting method are soaked in the pond, and all the stirring gold extracting method with claim 1 is identical, just with 2) the leaching operation changes into: gold mine grain and the gold leaching solution of granularity 0.3～3mm are put into soaking pit, liquid is crossed the surface of ore particle, about 2: 1 of solid-liquid weight ratio is soaked 12～24h, obtains auriferous leach liquor; 3) adsorption operations changes into, allows auriferous leach liquor flow through polyurethane foam case or post, cycle number time, and foam adsorbs the gold in the leaching liquid.
3. the method for a kind of rapid nontoxic gold extracting according to claim 1 is characterized in that, the sulfuric acid in the gold leaching solution of PH＜3 can be the mixing acid of hydrochloric acid, nitric acid or sulfuric acid hydrochloric acid, nitric acid.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100505006A CN100562590C (en) | 2007-11-08 | 2007-11-08 | A kind of rapid nontoxic gold extracting method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100505006A CN100562590C (en) | 2007-11-08 | 2007-11-08 | A kind of rapid nontoxic gold extracting method |
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| Publication Number | Publication Date |
|---|---|
| CN101157986A true CN101157986A (en) | 2008-04-09 |
| CN100562590C CN100562590C (en) | 2009-11-25 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101736159B (en) * | 2009-09-02 | 2011-04-20 | 紫金矿业集团股份有限公司 | Method for recovering gold from alkaline waste water |
| CN105861852A (en) * | 2016-03-04 | 2016-08-17 | 北京科技大学 | Cyaniding-free gold extraction method |
| CN108004416A (en) * | 2017-12-08 | 2018-05-08 | 广东金业贵金属有限公司 | Using nontoxic gold extracting reagent containing golden tin material gold extracting method |
| CN109387450A (en) * | 2017-08-08 | 2019-02-26 | 上海老凤祥首饰研究所有限公司 | Platinum content measuring method in a kind of platinum-nickel alloys ornaments |
-
2007
- 2007-11-08 CN CNB2007100505006A patent/CN100562590C/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101736159B (en) * | 2009-09-02 | 2011-04-20 | 紫金矿业集团股份有限公司 | Method for recovering gold from alkaline waste water |
| CN105861852A (en) * | 2016-03-04 | 2016-08-17 | 北京科技大学 | Cyaniding-free gold extraction method |
| CN105861852B (en) * | 2016-03-04 | 2018-09-28 | 北京科技大学 | A method of without cyanidation gold-extracted |
| CN109387450A (en) * | 2017-08-08 | 2019-02-26 | 上海老凤祥首饰研究所有限公司 | Platinum content measuring method in a kind of platinum-nickel alloys ornaments |
| CN109387450B (en) * | 2017-08-08 | 2021-02-19 | 上海老凤祥首饰研究所有限公司 | Method for measuring platinum content in platinum-palladium alloy ornament |
| CN108004416A (en) * | 2017-12-08 | 2018-05-08 | 广东金业贵金属有限公司 | Using nontoxic gold extracting reagent containing golden tin material gold extracting method |
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| Publication number | Publication date |
|---|---|
| CN100562590C (en) | 2009-11-25 |
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